Flow generator casing



FIG. 1 is a perspective view of a flow generator casing according to an embodiment of the present invention;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a rear view thereof. 

The ornamental design for a flow generator casing, as shown and described. 